I haven't used lubegaurd however I have used everything else and I gotta say I agree with you. I'm not one to spend good money on stuff that doesn't work,so if I found a product didn't work as advertised I certainly wouldn't spend good money on it.

I know a couple of VERY reputable locally owned transmission shops. In talking to them about transmission rebuilds, BOTH of them told me that they add a bottle of Lubegard Red and install a Magnefine transmission filter on EVERY transmission rebuild they send out the door. After they started doing these two things, they tell me that comebacks have become virtually non-existent.Shortly after talking with these guys, I helped a friend move a HEAVY trailer across the country with his diesel pickup which has a transmission temperature gauge on it. As we were driving we somehow got into a discussion about additives. I told him what the transmission shops told me about Lubegard and how the manufacturer makes the claim that it lowers transmission temperatures (and by so doing, prolonging the transmission life). We stopped at an auto parts store that we came across along the way and he bought 2 bottles of Lubegard red. He added both of them to his transmission. Sure enough, the transmission temperature gauge started reading about 30-40F cooler after adding it. We were BOTH sold on it right then!Since then, I have installed Magnefine transmission filters and added Lubegard red to all of my vehicles.

LG Red does lower transmission temps even with full synthetic fluid. I proved it with a scan tool. I don't remember the exact temp drop but it did drop it enough to make a difference.

Lube Guard, Liqui Moly, BG, Redline, Chevron (Techron), Molykote, Kano Labs and a few others make very good products, no snake oil IMHO.I must admit i like Lube Guard products a lot, their PS additive works really well also. As you all know i am not a fan of just using additives for the sake of it but they can be of real benefit in many situations.

If the torque converter clutch was engaged near full time in both situations, with similar loads and ambient temperatures, that is a staggering difference I can't fathom assuming proper ATF was already in there.

Update after 1 week:The car is driven by wife daily about 20 miles round trip 30% highway 70% city, so far she put on about 150 miles. Average speed according to the trip computer is 29 MPH and gas mileage is 20.3 MPG.

When the car had M1 0W40 the first 90-100k miles the gas mileage was around 18.0-18.5 MPG when the average speed was 29 MPH, it dropped to 17-17.5 with 28 MPH average.

About 6-7 years ago I used thinner oil: PP 5W20, M1 0W20 ... with 1 oz per quart VSOT the gas mileage went up to 19.0-19.5 with average speed of 29 MPH, 18.5-19.0 with 28 MPH.

Looks like MOS2 improves gas mileage about 3-5%. Will update the fuel economy in 2-3 months.

Update after 1 week:The car is driven by wife daily about 20 miles round trip 30% highway 70% city, so far she put on about 150 miles. Average speed according to the trip computer is 29 MPH and gas mileage is 20.3 MPG.

When the car had M1 0W40 the first 90-100k miles the gas mileage was around 18.0-18.5 MPG when the average speed was 29 MPH, it dropped to 17-17.5 with 28 MPH average.

About 6-7 years ago I used thinner oil: PP 5W20, M1 0W20 ... with 1 oz per quart VSOT the gas mileage went up to 19.0-19.5 with average speed of 29 MPH, 18.5-19.0 with 28 MPH.

Looks like MOS2 improves gas mileage about 3-5%. Will update the fuel economy in 2-3 months.

IIRC Clevy mentioned mpg gains as well using it, over a very long period of recording it.

I've had good luck with mos2 improving highway fuel economy but only in v6 and v8 engines. Every 4 cylinder I've tried it in the owners did mention that the engine was very smooth and quiet but no fuel consumption changes. They were newer vehicles too which may have something to do with it as well.